"I always go out there ready to play. You always go out with the intention of playing and when you do get a chance, just don't screw it up," said the Liverpool goalkeeper.
"The mentality (in your preparation) is the same - you need to compete whether you are playing or not.
"Iker is playing at a high level and there is no reason to replace him. I know that I could be called in at a difficult moment and I would be delighted to help.
"I hope not, but if something like an expulsion or an injury happens to Iker, you have to be ready."
